Fracture toughness and high temperature strength of unidirectionally solidified Nb-Si binary and Nb-Ti-Si ternary alloys

被引：160

作者：

Sekido, Nobuaki ^{[1
]}

Kimura, Yoshisato

Miura, Seiji

Wei, Fu-Gao

Mishima, Yoshinao

机构：

[1] Univ Wisconsin, Dept Mat Sci & Engn, Madison, WI 53706 USA

[2] Tokyo Inst Technol, Dept Mat Sci & Engn, Yokohama, Kanagawa 2268502, Japan

[3] Hokkaido Univ, Div Engn & Mat Sci, Sapporo, Hokkaido 0600813, Japan

[4] Tokyo Inst Technol, Dept Mat Sci & Engn, Yokohama, Kanagawa 2268502, Japan

[5] Natl Inst Mat Sci, Steel Res Ctr, Tsukuba, Ibaraki 3050047, Japan

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2006年 / 425卷 / 1-2期

关键词：

intermetallics; unidirectional solidification; scanning electron microscopy; strain; MECHANICAL-PROPERTIES; BEHAVIOR; MICROSTRUCTURES; COMPOSITES; PHASE;

D O I：

10.1016/j.jallcom.2006.01.071

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The (Nb)/NTb3Si eutectic alloys in the Nb-Si binary and Nb-Ti-Si ternary systems were unidirectionally solidified in an optical floating zone melting furnace. The effect of solidification rates on microstructures of the alloys is investigated. The coupled growth of (Nb) and Nb3Si is observed in the binary alloy solidified at 10 mm/h. The ternary alloys exhibit the development of discontinuous (Nb) particles within the Nb3Si matrix. The unidirectionally solidified alloys show improved fracture toughness and enhanced high temperature compressive strength as compared with the arc-melted counterparts. The role of an aligned eutectic microstructure in toughening is discussed from the existing models based on the crack bridging and the crack deflection. (c) 2006 Elsevier B.V. All rights reserved.

引用

页码：223 / 229

页数：7

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